Malicious PDF — malware analysis report

Static analysis result for SHA-256 3684ad7d9f230f4e…

MALICIOUS

PDF

41.1 KB Created: 2020-04-05 11:52:49 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f6acbe30c49aea6e15e05c28e160282c SHA-1: 5a5f4d76d37e0d0bd589330d7a6cd0bea40869e2 SHA-256: 3684ad7d9f230f4edf11ed8fb6ac5512f2715b6e585d1d98a9386e546271cbb8
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic. The document body text, though partially corrupted, includes the title 'Que importancia tienen las bacterias en el ecosistema' and references the wkhtmltopdf tool, suggesting a lure document. The primary attack pattern involves directing users to a vast array of external PDF files hosted on numerous domains, which could be used for SEO spam or to distribute further malware. The ML_NYX_PDF_MALICIOUS heuristic strongly supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://spectrumherniaclinic.com/uploads/1/3/0/3/130379718/130379718.html#que+importancia+tienen+las+bacterias+en+el+ecosistema
    • http://clwmontessori.com/uploads/1/3/0/6/130620869/126c9c583d4cd.pdf
    • http://cicerothesheep.com/uploads/1/3/0/7/130740141/resuf.pdf
    • http://chrisschorpp.de/uploads/1/3/0/4/130476083/9044636.pdf
    • http://ozteachthailand.com/uploads/1/3/1/0/131070457/5428421.pdf
    • http://sol-nails.com/uploads/1/3/0/2/130289530/rumodagejadel-tepog-noguvexowel.pdf
    • http://performskatewear.net/uploads/1/3/0/6/130639646/ef426a810c76968.pdf
    • http://christinamarykow.com/uploads/1/3/0/5/130588651/gorap-livab.pdf
    • http://gomakedisciplesministry.net/uploads/1/3/1/4/131437061/6738060.pdf
    • http://limayapi.net/uploads/1/3/1/3/131380951/lowibadesivitubaj.pdf
    • http://generationmoxie.com/uploads/1/3/0/3/130312914/wibal.pdf
    • http://motoinspektor.com/uploads/1/3/0/8/130814441/bupopuge-pifevexu-jusufifopi-wexelapowidut.pdf
    • http://buzzybeestudio.com/uploads/1/3/0/6/130639055/dadasekuxobogokejom.pdf
    • http://worldclassdesignsource.com/uploads/1/3/0/9/130969945/mizeg_letiludopavowed_gutoxowoje_goliwamoximi.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007556.bin
55b8b1533a867a974a8d6e4beb845ff50295d0b76425084e82ec40cf8af3eba1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7556 8772 bytes

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